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草业学报  2014 

分层变端元混合像元分解的新疆北部积雪分量制图研究

DOI: 10.11686/cyxb20140437, PP. 300-310

Keywords: 分层变端元混合像元分解,积雪分量制图,新疆北部,MODIS

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Abstract:

新疆北部冬季常多云天气,受地形和植被等因素影响,积雪分布不均,这导致了积雪分量遥感制图精度不高的难题。针对这一问题,本文利用MODIS影像,提出了分层变端元混合像元分解的积雪定量反演方法。该方法首先建立研究区影像和参考端元库,再对区域影像地类进行从粗到细的逐级划分,对每级包含的地类进行2端元或3端元混合像元分解。通过对上一级解混后与积雪相关的子类再实施上述变端元混合像元分解方法,得到下一级更细的地类划分。综合各级地类解混结果实现了高精度积雪分量制图。以HJCCD影像分类数据、植被分布数据和实测数据为数据源,验证了变端元解混时模型包含端元数较少时(如2端元或3端元)研究区域积雪分类精度最高,为87%。反之,包含端元数越多,分类精度会降低。

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